People with high rpm 2.2's: Crankshaft dampner.

[A2Carat]

Hey,

I am looking for some serious advice and experience regarding harmonic dampners for the 2.2. I am building a NA 2.2 for the GLH and has everything lightened internally (crank, rods, pistons, flywheel). It was brought to my attention that at high rpms (7000+), because of the reduced weight, a harmonic balancer on the end of the crank will benefit and reduce high rpm vibrations/reverberations, etc. I have an underdrive pulley (quite small compared to stock pulley) and this apparently increases the vibration problem. I am aiming for 200whp and higher RPM's .. (course use) .. what are your thoughts and experience on this?

Thank you for taking the time,
Francis G.

[badandy]

When everything was lightened internally it was also spin balanced correct? Our engines are internally balanced from the factory although not to the degree that you are looking for.

[ShelGame]

Dampers are used to reduce torsional vibrations. Which, generally, are not a problem for a flat-plane crank. Chrysler did add one to the 2.4, but it was really for harshness reasons, not durability.

V8's (and V6's) use dampers because the crank resembles a twisted noodle with it's 90 deg (or 60deg) throws. Torsional vibrations can be a problem with those crank configurations.